16 animation style

[okwme]

closes #16

https://user-images.githubusercontent.com/964052/228943269-70f61c69-279d-4a4c-bbe3-f429efabe1c3.mov

works with:

• solid color segments
• image clip segments
• masked image clip segments
• debug view

also contains:

• 4 color background gradients
• processing optimizations with cached masked segments and cached background segments
• head as segment (doesn't look good)
• slight refactor of drawSegments to combine drawImgs, drawLines and drawDebug

[netlify[bot]]

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